8-B-4
Chapter 8: Gas Analyzer Calibration
42/24-10 EN Rev. 9
Calibration Data for Automatic Calibration,
continued
Pump
This determines whether the pump is on or off during automatic calibration. This
setting also applies to manual calibration.
Purge Time
This determines the length of the interval during which the gas paths will be purged
to eliminate any residual gases that might interfere with calibration or
measurement:
•
Between turning on the zero gas flow and starting zero calibration
•
Between turning on the test gas flow and starting span calibration
•
Between restarting the sample gas flow and initiating measurement
The purge time should be set to at least three times the T
90
time of the entire
analyzer system.
Single Zero
Calibration
Determines whether zero calibration will always or never be carried out alone,
i.e. without subsequent span calibration.
Single Span
Calibration
Determines whether span calibration will always or never be carried out alone,
i.e. without prior zero calibration.
Zero and Span
Calibration
Determines whether zero and span calibration will be carried out jointly always or
never or at every n
th
automatic calibration.
Example:
•
Single Zero Calibration
Always
•
Single Span Calibration
Never
•
Common Zero and Span Calibration Every 7
th
This setting effects with a cycle time of 1 day a zero calibration being
carried out every day and a span calibration being carried out once a
week.
For the Caldos25 , Caldos27 , Magnos206 and Magnos27 analyzer modules,
these parameters must be set up such that the zero point calibration always
precedes end point calibration.
Calibration Method
The method for automatic calibration needs to be set for the selected sample
component (see also “Calibration Methods” section, page 8-A-10).
The zero and span calibration measurement ranges for common and substitute
gas calibration are chosen in the
Manual calibration
→
Calibration
method
parameter.
The “Calibration method” parameter is not available in the Limas11 and Uras26
analyzer modules since automatic calibration is always run as common calibration.